const fp = require('lodash/fp')
    // 数据：horsepower 马力，dollar_value 价格，in_stock 库存
const cars = [
    { name: 'Ferrari FF', horsepower: 660, dollar_value: 700000, in_stock: true },
    { name: 'Spyker C12 Zagato', horsepower: 650, dollar_value: 648000, in_stock: false },
    { name: 'Jaguar XKR-S', horsepower: 550, dollar_value: 132000, in_stock: false },
    { name: 'Audi R8', horsepower: 525, dollar_value: 114200, in_stock: false },
    { name: 'Aston Martin One-77', horsepower: 750, dollar_value: 185000, in_stock: true },
    { name: 'Pagani Huayra', horsepower: 700, dollar_value: 130000, in_stock: false }
]

console.log(fp.flowRight(fp.prop('in_stock'), fp.last)(cars))

console.log(fp.flowRight(fp.prop('name'), fp, first)(cars))



let _underscore = fp.replace(/\W+/g, '_')
let log = value => {
    console.log(value)
    return value
}

let getDollar = car => car.dollar_value
let f = fp.flowRight(_average, fp.map(getDollar))
f(cars)



let sanitizeNames = fp.flowRight(fp.map(_underscore), fp.map(fp.toLower), fp.map(car => car.name))

console.log(sanitizeNames(cars))